Range-resolved detection of potassium chloride using picosecond differential absorption light detection and ranging

Tomas Leffler, Christian Brackmann, Andreas Ehn, Billy Kaldvee, Marcus Aldén, Magnus Berg, Joakim Bood

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9 Citations (SciVal)

Abstract

A laser diagnostic concept for measurement of potassium chloride (KCl) and potentially other alkali compounds in large-scale boilers and furnaces of limited optical access is presented. Single-ended, range-resolved, quantitative detection of KCl is achieved by differential absorption light detection and ranging (DIAL) based on picosecond laser pulses. Picosecond DIAL results have been compared experimentally with line-of-sight measurements using a commercial instrument, the in situ alkali chloride monitor (IACM), utilizing differential optical absorption spectroscopy. For centimeter-scale range resolution and a collection distance of 2.5 m, picosecond DIAL allowed for measurement of KCl concentrations around 130 ppm at 1200 K, in good agreement with values obtained by IACM. The DIAL data indicate a KCl detection limit of around 30 ppm for the present experimental conditions. In addition, a double-pulse DIAL setup has been developed and demonstrated for measurements under dynamic conditions with strong Mie scattering. The picosecond DIAL results are discussed and related to possible implementations of the method for measurements in industrial environments. (C) 2015 Optical Society of America
Original languageEnglish
Pages (from-to)1058-1064
JournalApplied Optics
Volume54
Issue number5
DOIs
Publication statusPublished - 2015

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics

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